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IEEE 802.22 wireless regional area network (WRAN) standard employing cognitive radios is gaining much attention recently. The WRAN standard targets reuse of unused TV channels. We propose a device-to-device wireless regional area network (D2DWRAN) to extend the capacity of IEEE 802.22. Network capacity can be increased by supporting direct intra-cell device to device (D2D) communication through channel...
Flexible channelization can enhance spectrum efficiency by adapting channel bandwidth and center frequency compared with traditional fixed width channel. The key challenge of this new mechanism lies in how to determine proper channel width for each link in a distributed manner without coordination. In this work, we investigate the spectrum sharing problem with flexible channelization from game-theoretic...
Enterprise WLAN consists of many APs connected to wired backbone network. Conventional DCF mechanism can not completely prevent conflicts between APs which cause large quantities of transmission failure and retransmission overhead. However, to keep compatible with 802.11-compliant clients, it is difficult to discard DCF. In this paper, we proposed a framework called DPS, which incorporates centralized...
The spatial and temporal variations of licensed spectrum bands introduce new problems to cognitive wireless LANs. We propose a novel client-centric heterogeneous spectrum access mechanism to deal with these new challenges. All clients in a cell would not have to use the same channel to communicate with access point when there is no common available channel among these clients. In order to achieve...
It is a common case that a one-way TCP data flow is set up between a client and a server when the client accesses the Internet through wireless mesh networks (WMNs). Since both IEEE 802.11 and TCP have acknowledgement (ACK) mechanisms for transmission reliability, the functional duplication results in overhead. In this paper, a cross-layer MAC protocol for one-way TCP data flow performance enhancement...
In this paper, a High-throughput Context Adaptive Variable Length Coding decoder which is capable for supporting AVC/H.264 HP@level 4.2 has been presented. To increase throughput, multi-symbol decoders for “LEVEL” and “RunBefore” and architecture of fast zero insertion are presented to reduce processing cycles to reach high-throughput rate. Finally, the experimental results show that the throughput...
Wireless mesh network (WMN) is deemed as a promising technology to provide last few miles connectivity. Multi-radio multi-channel mesh nodes are often used to increase the chance of concurrent transmission. Although IEEE 802.11b/g standards define 11 available channels, the maximum number of non-overlapping channels is only three. Most existing channel assignment schemes are based on these non-overlapping...
Wireless interference is a key issue affecting network performance. In this paper, we address the broadcast scheduling problem in wireless multi-hop networks with interference. We propose a policy called EMDF (evolved minimum degree first) which assigns different transmission slots for nodes within a three-hop neighborhood to effectively decrease the conflicts caused by both hidden terminal problem...
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